In order to install ROracle I did the following:
- installed RTools (Rtools215.exe)
- made sure RTools is in the PATH
- installed DBI: R CMD INSTALL DBI_0.2-5.tar.gz
- installed the instantclient basic and sdk (version 11.2.0.1.0) by extracting it at C:\instantclient\i386\instantclient_11_2
- ran R CMD INSTALL --build ROracle_1.1-4.tar.gz
This does not work.
I get the following error popup when 'testing if the installed package can be loaded':
Entry point not found

The procedure entry point OCIArrayDescriptorAlloc could not be located in the dynamic link library OCI.DLL.

I just checked the 11.2.0.3 basic and basiclite zip files that contain oci.dll and the entry point exists in them. Used location http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html?ssSourceSiteId=ocomen

Anyway, we will be uploading a new version of Roracle that does not have this dependency shortly.

Thanks for checking. I also got the client files from the link you indicated. Namely for 'Instant Client for Microsoft Windows (32-bit)'.
Anyhow, I'll stick to the older version of ROracle without datetime support.
Looking forward to see your new ROracle version at CRAN where this installation issue will not occur.